Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!!

R Rogers wrote:

>Hi Jon,
>
> I meant to mention when I ran the servo motor off the bridge. I was not wired through the Gecko.
>

Oh, totally different!

> Just running the servo as a DC motor to look at it and get an idea of the rpm at that voltage.
>

But, the motors were NOT getting the full voltage. They were getting
intermittent
spurts of voltage from the rectifier 120 times a second.

> Those motors are very powerful!! Thats another thing that I'm wondering about. I see guys putting gas cylinders on the knee to assist the servo or stepper. I shouldnt have to do that, should I? 40 lb/in per 2500 rpm max and 13.0 continuous amps, 30 amps peak. 40 volts per k of rpm.
>
>

If you find the knee motor or Gecko running hot, resisting the weight of
the knee,
then you might have to. With Acme screws it is not likely to be a
problem, with
ball screws, it might be.

Ah, Kv = 40, so 60 V will give about 1500 RPM. 40 In-Lb/amp is the Kt. At
13 A that is 520 In-Lb (8320 In-Oz for the stepper crowd!), and at 20 Amps
(max for the Gecko) it is 800 In-Lb. You may have to use 2" belts to couple
the motors. They sound strong enough to do direct drive, but a coupling
that
can handle that sort of torque will be a bear!

Jon